Numerical optimization of hypersonic drag reduction technique based on concentrated energy addition is presented in this study. A reduction in wave drag is realized through concentrated energy addition in the hypersonic flowfield upstream of the blunt body. For the exhaustive optimization presented in this study, an in-house high precision inviscid flow solver has been developed. Studies focused on the identification of “optimum energy addition location” have revealed the existence of multiple minimum drag points. The wave drag coefficient is observed to drop from 0.85 to 0.45 when 50 Watts of energy is added to an energy bubble of 1 mm radius located at 74.7 mm upstream of the stagnation point. A direct proportionality has been identified between energy bubble size and wave drag coefficient. Dependence of drag coefficient on the upstream added energy magnitude is also revealed. Of the observed multiple minimum drag points, the energy deposition point (EDP) that offers minimum wave drag just after a sharp drop in drag is proposed as the most optimum energy addition location. © 2017 IAA

Bibin John

Department of Thermal and Energy Engineering

School of Mechanical Engineering

Vellore Campus

Ashwin Ganesh M

Vellore Institute of Technology (VIT) is a private university located in&nbsp;Tamil Nadu, India. Founded in 1984, as Vellore Engineering College, the institution offers 20 undergraduate, 34 postgraduate, four integrated and four research programs. It has campuses in Vellore, Amravati, Bhopal and Chennai.

VIT is one of the top ranked private universities in India according to NIRF, THE and QS Rankings.&nbsp;Govt. of India has recognized&nbsp;VIT, Vellore as an&nbsp;Institution of Eminence. This has allowed VIT to take independent quality initiatives and move up in world ranking.

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VIT University

Acta Astronautica

Energy addition has been considered a means to improve the performance of supersonic inlets. The energy addition to supersonic inlets can be considered as a virtual cowl, which can be implemented during off-design conditions to essentially emulate the shock-on-lip (SOL) condition obtained at the design point. The primary purpose of this work is to increase the mass capture and the pressure recovery and reduce flow distortion at the exit of the isolator section by finding the optimum location and energy required to enhance the performance of the intake section. Parameters like magnitude and location of energy addition were examined. The performance was assessed using mass capture, total pressure recovery, static-pressure rise, and flow distortion. The effects of shock reflections at the exit and the shifting of separation zones due to energy addition have also been understood and discussed. An energy addition of 0.2 MW/m was found to be most suitable at a region that is near the cowl leading edge. Moving below or far above the cowl line was found to decrease the performance. The improvement in mass capture with suitable parameters can be up to 15%. © 2019 American Society of Civil Engineers.

Journal of Aerospace Engineering

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Journal	Data powered by TypesetActa Astronautica
Publisher	Data powered by TypesetElsevier BV
ISSN	0094-5765
Open Access	0